About

Jan Allison Costello is a dedicated attorney with extensive experience in litigation and tax matters, serving clients through the Law Offices of Jan Allison Costello, Pierson Law Firm LLC, and Pierson Law Firm, LLC. Based in Darien, Connecticut, she represents individuals and businesses facing complex legal and financial challenges, providing thoughtful counsel tailored to each client’s goals and circumstances. Her practice reflects a strong commitment to clear communication, careful legal analysis, and practical solutions designed to help clients move forward with confidence. In litigation matters, Jan Allison Costello brings a strategic and detail-oriented approach to resolving disputes efficiently and effectively. She understands that litigation can be stressful and disruptive, and she works to guide clients through every stage of the process with professionalism and focus. Whether addressing commercial conflicts, civil disputes, or other contested matters, she is committed to protecting her clients’ interests and advocating for favorable outcomes. Her tax practice further complements her litigation work, allowing her to assist clients with issues that require both legal insight and financial precision. She works diligently to help clients navigate tax-related concerns with clarity and confidence, always striving to provide responsive representation grounded in experience and integrity. Known for her personalized service and client-centered approach, Jan Allison Costello is dedicated to delivering dependable legal guidance to clients throughout Connecticut and beyond.

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